NOTE: As their name suggests hints are not exactly Arkanoid DS cheats, and are usually just simple (but very useful) tips on how you can unlock secret level, features, find hidden areas and such. Hopefully these will make playing Arkanoid DS even more entertaining.

Level Select
At the start screen, hold down "Start", "A", and "B". When the level number you want is displayed, release the buttons.

Start from the level you got a game over on
When you get a game over and return to the title screen, hold "A" and "B" while pressing "Select" 5 times. Then press "Start".

Unlock Uranoid Mode
Complete all levels to save all your friends and Uranoid mode will be available when you return to the main menu.

Unlock BGM 10, 11, and 12
Earn a high score upon completing each of the final three Uranoid mode stages to obtain the corresponding BGM tracks:

BGM 10 Happy smiling - Get a hi-score of 400,000 or more completing Eta
BGM 11 Captain Neo - Get a hi-score of 400,000 or more completing Theta
BGM 12 Revenge of arkanoid - Get a hi-score of 400,000 or more completing Iota